These handlebars are identical in every way except that one is stamped REDLINE and the other isn't. Do I have two sets of Redline bars or two knockoffs?

other than the stamp, they might be the same. the japanese (some, at least) RL bars were made by "WIN", who also sold them under their own name (others used them, too).

i have a set that has the win stamp under the grip and is also stamped redline.

Whats the widest redline V bars ever came in? Seems like I have never seen a 28" wide version.

From Dec 1978 BMXA

The early V bars were not stamped they only had the sticker.

Those Redline V-bars were made by WIN in Japan I believe.

I have a set of WIN V-bars on my Kuwahara.
WIN V-bars were standard items on KZ series.
They usually had a WIN sticker on them.
The Redline ones only differred with a stamp (as above).

My Redline V-bars seem to be the Pro Line wide version (around 26")

PS: - I've put my WIN and Redline bars next to each other - identical.

Makes sense, if you remember RedLines and Kuwaharas were spec'd wth similar parts. My redline bars have a different stamp on them. The oval logo.

I have a 600a with the original v-bars and they are way bigger than I remember, at least 28". I'll measure tonight. I'm sure they're WIN as well as the stem.